Means for heating intake manifolds for internal-combustion engines



Mar.13,1923.. 1,4473% J. R. FRANCIS MEANS FOR HEATLNG INTAKE IMANIFOLDS FOR INTERNAL COMBUSTION ENGINES Filed 00%. 26. 191.?

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l atented i i 3a,. i3, lQZBQ i n a g s -arnir or JACOB RICHARD FRANCIS. O FLIHT, MICHIGAN.

Application filed October 26, 1917. Serial No. 198,885,

usc'inl improvements in Means tor Heating intake Manifolds for Intcrnal-Combustion llngines, oi which the following is a specili= nation, refm'encc lacing had therein to the ac' coinrzan 'ing drawing.

'lhis invention rclatcs to certain new and useful iinprovcincnts in means for heatin; the intake manifold of an internal comhustion engine and more mrtiifrularlv to means For controlling the liuid heating nicdiuin. as it has hcen. found in practice owing to the heavy ooh-volatile fuels. called hy the trade gasoline distillatc. motor the]. ctc.. now in general use for internal combustion engines, that it is necessanv to use heat to aid in volalilizingr the fuel portion of the mixture of the charge in order to ohtain a satisfactory combustion oi the explosive charge within the internal coinhustion engine. and it is particularly desirahlc to have a large'vohnne of hchtcd ihiid applied tc the charge in first starting and warming up the engine so as To ohtai i as nossihlc and then to reduce the volume of the hcalirw' linid applied as otherwise the charge ouingto the natural radiation of heat from the engine. will hecomc too hot and the power of the engine willtheret'ore he reduced.

Li have found in'practicc in starting a cold engine with any of the above-mentioned fuels unless heat he applied to the outside walls of the intake manifold, a large pcrccntag e of the fuel fails to properly volatilwhich causes inconfpletc combustion. and as a result the heavy part of the fuel is left on top of the pistonafter the combustion stroke of the engine, and this unburned non tion of the fuel then finds its way past the piston rings into the crank case and dilutes or thins; the lubricating oil contained therein thus rendering the latter inefficient which causes undue Wear on the bearings, of the crankshaft piston: etc. "This undesirable. result can be eliminated in starting a cold engine it the intake manifold be heated to the lie .d temperature quickly as possible in order lio preheat or more perfectly volatilize the heavy portions of the fuel of the intake charge.

I. am aware tha I am not; the first in the a rnoi'c perfect combustion as early art to heat the intake, manifold of an inter nal combustion engine but in prior devices the tluid heating medium was not under the control of the operator. and H'lfv invention consists in providin; means for controlling the application of the exhaust gases from the engine whereby I am able to obtain the desired result quickly by the use of a large volume of the exhaust gases 'trom the engine to heat the manifold for any desired period of time in connection with air-ans for reduc ing or deflectin in part or completely the volume of exhaust gases so used.

Other and further objects and advantagei; of the invention will he hcreinal'tcr set forth and thenovel features thereof defined hy the appended claims.

In the drawing l have sl'imvn a side elevation of a portion oi a multiple cylinder in ternal combustion engine showing the application of my improved construction of hesi.-' ingz means for the intake manifold in whici 1 indicates the internal conili-iistion engine. the intake manifold which is connected to a throttle chamber of a carburetor, ll ,in the usual manner in which thek'hargc is mixed and delivered to the manifold from which it; is drawn by the suction of tie engine into the cylinders thereof. The engine is pro vided with the usual exhaust pipe 4: herein shown having two hrancl'ics 5 and it the branch 5 being: adapted to he connected lo'the nuitlicr in the usual manner.

My invention consists in surrounding! the intake manifold 2 of the engineivith a jacket 7 in order to provide a heating chamber surroimdin; the manifold whet-shy I am able to heat the manifold so as to obtain the. desired result as will ho hereinafter fully described.

The heating jacket is provided with an in let 8 of substantially the same size as the branch 6 of the exhaust pipe to which is connected a valve casing 9 having a pivoted valve 10 carrying an arm 11 which is corn nected to the lever 12 of the throttle valve 12, of the carburetor 3 by a link 13, said lever having a rod 14 extending to the dash for controlling the same in the usual manner. The throttle valve '19 of the carburetor is so mounted and connected by the link 18 to the valve 10 that when, the throttle valve of the 'carhnr'etei" is jcl osed the'damper or valve '10 is wide open, and when the throttle valveof the carhureter is open the damper 10 is closed. Connected to the valve casing will) 9 is a conduit 15 carrying a valve casing 16 which is connected to the branch 3 ol. the haust pipe l and is provided with it valve 1?" having a crank arm 18' for operating, the same to which is connected a rod ll) extending to the dash so to be manually operated. The valve ii is normally held closed by a coil'spring 20 connected at one end to the urin l8 and at its opposite. end to an eye formed on the jacket T as clearly shovvn. The valve casing 143 is provided vvith a lug; 21 carrying a set screw 22 orrui'iged in the path of travel of the arm 18 by means of which thepositioh of the valve 17 in respect to its seat can be regulated.

The branch 5 of the exhaust pipe has :1 pivoted valve or damper mounted therein carrying an arm 23 to which is connected :1 rod 24;. extending to the dash so as to be inanuallv operated, said valve being normally hel in open position by e. coil spring extending from the arm 23 to an eye formed on the jacket 7. The position of the valve 22 can be adjusted through the medium ot' adjusting screw 26 mounts lin a log 2], said screw being arranged in the path oi travel of the arm 23 as clearly shown.

In the drawing the valve- .32 is shown wide open. and held in that position by the coil spring 25 and by udjusting the set s .l'iW :26 so as to allow the arr-:1 further movement, the outlet branch 5 of the exhaust :pipe it run be normally held portly closed. The jacket 7 is provided With an outlet 2?; through which the exhaust gases escape after they have circulated around the manifold.

From the foregoing description it will be seen that I have provided a pipe leading from the QXlilfliSlchamber of the engine to the surrounding the intake manifold loving; valve actuated by :1 spring so as to llerillfdllr'-h0ld valve in closed position, said being; manually operated and provided with means for adjusting the relative position oftiie valve to its seat whereby the. seine be normally held partly opened. in connection with this means for controllin' the pussoqe of exhaust gases to the heat. jac net, I provide the other branch of the exhaust pipe With. a manually operated and adjustable valve which enables me to completely close'thisbranch ot' the exhaust so as to cause the entire volume of exhaust rases tdpgss o'ut through the other brunch into the conduit 15' lro i which they are discharged into the heat -l t so o obtain is quick heating of manifold when it is desired to start the engine.

It will be seen that these-two valves or dampers are manually operated and in order to provide means for further controlling the volume of initial relating; fluid, 1 provide meansfor controlling the. entrance oil the ex heust gases into the .elret by a valve which has at connect-ion W h the throttle valve of the corbureter so that when the throttle is closed the valve is open and as the throttle valve is open the valve is closed, whereby means is provided for iroportionately 3L lowing the exhaust gases to enter the heat jacket the throttle is operated.

The operation of m improved construc tion oil? heating means as follows: Assuming that the parts are in the position as shown and it is desired to start a cold engine, -llie manually operated rods l9 and Q-l which are preferably controlled from the dash when used in connection with on internal combustion engine mounted in a vehi cle, are shifted so as to close the branch 5 of the exhaust. pipe 4 and open the branch 6 which allows the entire volume of exhaust gases to pass into the heating jacket so as to heat the manifold quickly in order to obtain a thorough combustion. of the charge entering the cylinder, and as the heat of the engine increases the rod 2i is released which allows part of the exhaustto escape in their natural course. As the valve 17 is in open position a portion of the exhaust gases will pass through the conduitlo into the inlet oi the jacket 7 and out the outlet 28 thereof which will heat the manifold, and as the throttle is openedthe passage of exhaust gases through the heating jacket is regulated by the valve 10. By shifting the rod 19 the valve ll will be adjusted so as to allow the desired proportion of the exhaust to enter the conduit 15 ot the heating jacket 7,.

ii claim:

l. The combination with an internal combustion engine having an exhaust pipe, in take. manifold, and carbureter connected thereto, ot' a heating jacket surrounding said manifold. said, exhaust pipe having a. branch extending therefrom; a conduit connecting said branch to said heating jacket, a spring actuated valve mounted in said branch for controlling the udniission of heating fluid to said heatingjacket, means for adjusting the relative position of said valve in respect to its seat for predetermingly regulating the volume of exhaust gases admitted to said jacket, and a connection between said valve and the dash of the motor vehicle.

2. Thefconibination with an internal combustion engine having an exhaust pipe, intake manifold 21nd carburetor connected thereto, of u heating jacket surrounding said manifold, u conduit extending from said exhaust. to said jacket, a dash controlled valve for regulating the admission oi heating" fluid to said conduit from said exhaust, a. spring tor normally holding said valve in partly closed position, and adjustable means for limiting the movement oi said valve in one direction for setting said valve to govern the volume or gasesfodmitted to said jacket.

mamas 3. An internal combustion en ine having an exhaust pipe, intake manifo db and carbureter connected thereto, said exhaust pipe havin two branches, a heating jacket surroundmg said manifold, a conduit extending from one branch of said exhaust to said jacket, 3. spring actuated valve mounted in said conduit for controlling the admission of heating fluid to said heating jacket, means for adjusting the relative position of said valves with respect to the seat for regulating the volume of exhaust gases admitted to said jacket and a dash controlled spring actuated valve mounted in the other branch of said exhaust for controlling the outlet of said exhaust whereby the entire volume can be diverted into the other branch to be delivered to the heating jacket.

4;. An internal combustion engine having an exhaust pipe, intake manifold and carbureter connected thereto, means for throttling the explosive fluid, means for throttling the exhaust fluid, a heating jacket arranged to heat said manifold, a conduit extending from said exhaust to said heating jacket, a valve in said conduit having a connection with said carbureter throttling means and a dash controlled valve in said conduit preceding said throttle actuated valve for regulating the volume of exhaust gases padsing through said conduit irrespective of the position of said throttle con trolled valve.

5. The combination with an internal combustion engine, an exhaust passage and an intake passage communicating with said engine, a. heater for the intake passage, means for supplying exhaust gases to said heater, a valve in said exhaust passage for throttling exhaust gases, means for operating said valve to increase the flow of exhaust gases to said heater, and a spring tending to open said valve when the latter is disenga ed from its operating means.

6; he combination with an internal combustion engine having an exhaust passage and an intake passage in communication therewith, of a charge forming device for suppl ing explosive fluid to said intake passage aving means for throttling the flow of explosive fluid, a heater for heating said intake passage, means for supplying exhaust gases from said engine to said heater, means for throttling the exhaust passage, a valve having a connection with said throttle valve for controlling the passage of exhaust gases to said heater and a second dash-controlled valve preceding said valve for controlling the volume of exhaust gases to said heater.

7. An internal combustion engine having an exhaust passage, intake manifold and carbureter connected thereto, a heating jacket for heating said manifold, a conduit extending from said exhaust pipe to said jacket, a valve in said exhaust pipe for throttling the exhaust gases for diverting said gases through said conduit, a throttle valve for said carbureter and a valve in said conduit having a connection with said throttle valve.

8. An internal combustion engine having an exhaust passage, intake manifold and JACOB RXQHARD FRANCIS.

Witnesses:

C. C. Kacey, MARIE MEROILL. 

